Palm reading answer

What does a straight heart line mean?

Short answer

A straight heart line usually points to a practical, steady or more private emotional style. It does not mean someone is cold, and it is not the same as a simian line.

What this means

First confirm that the straight line is the heart line under the fingers, not the head line or a merged simian line.

Then read length, depth and ending point: a long clear straight line is different from a short faint one.

Use it as a clue about emotional expression and boundaries, not as a fixed prediction about love or marriage.